CN116488243A - Method and device for determining running mode of micro-grid system containing electrochemical energy storage - Google Patents

Method and device for determining running mode of micro-grid system containing electrochemical energy storage Download PDF

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Publication number
CN116488243A
CN116488243A CN202310512759.7A CN202310512759A CN116488243A CN 116488243 A CN116488243 A CN 116488243A CN 202310512759 A CN202310512759 A CN 202310512759A CN 116488243 A CN116488243 A CN 116488243A
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micro
load demand
grid system
grid
cost
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Inventor
王良友
孙长平
苏一博
乐波
周旭艳
王鹏磊
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China Three Gorges Corp
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China Three Gorges Corp
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Priority to CN202310512759.7A priority Critical patent/CN116488243A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a method and a device for determining an operation mode of a micro-grid system containing electrochemical energy storage, wherein the method comprises the following steps: obtaining a load demand variation of an electricity utilization end and a load demand of the electricity utilization end, determining a residual load demand exceeding the total output power of the renewable energy unit when the load demand is larger than the total output power of the renewable energy unit, determining a carbon emission amount in the micro-grid system based on the nonrenewable energy unit and an external power grid for power output based on the residual load demand, determining a total cost when the output power of the micro-grid system meets the load demand of the electricity utilization end based on the load demand of the electricity utilization end, the load demand variation of the electricity utilization end and the residual load demand, and determining a micro-grid system operation mode meeting the user demand according to the carbon emission amount and the total cost so as to reduce the influence on the environment in the operation process of the micro-grid system while reducing the operation cost of the micro-grid system.

Description

Method and device for determining running mode of micro-grid system containing electrochemical energy storage
Technical Field
The invention relates to the technical field of micro-grid operation strategy optimization, in particular to a method and a device for determining an operation mode of a micro-grid system containing electrochemical energy storage.
Background
The solar energy, wind power generation and other renewable energy source duty ratio is gradually increased, and the distributed power supply has the advantages of small investment, environmental protection, high flexibility and the like, and the development scale is rapidly enlarged. However, the randomness and volatility of the distributed power supply are uncontrollable, and large-scale application and access also bring about great challenges and impacts to the traditional power grid. The proposal of the micro-grid realizes the grid connection problem of flexible distributed power supply, large quantity and diversity. The method realizes reliable supply of various energy forms of loads, is an effective way for realizing an active power distribution network, and enables a traditional power grid to be transited to a smart power grid.
The micro-grid system is used as a novel power system, the structure and the operation requirements of the micro-grid system are different from those of the traditional power grid system, the technical core of the development of the micro-grid system in the future is planning, designing, protecting and controlling, and the like, and the influence of an operation control strategy is always needed to be considered when the micro-grid system designs an operation scheme. Therefore, it is needed to propose a method for determining the operation mode of a micro-grid system containing electrochemical energy storage, so as to reduce the operation cost of the micro-grid system and reduce the influence on the environment in the operation process.
Disclosure of Invention
Therefore, the invention provides a method and a device for determining the running mode of a micro-grid system containing electrochemical energy storage, which are used for reducing the running cost of the micro-grid system and reducing the influence on the environment in the running process.
According to a first aspect, an embodiment of the present invention discloses a method for determining an operation mode of a micro-grid system including electrochemical energy storage, where the micro-grid system includes: the system comprises an external power grid, a renewable energy unit, a non-renewable energy unit, an energy storage unit and an electricity utilization end; the renewable energy unit is used for supplying energy to the electricity utilization end, and the non-renewable energy unit and the external power grid are used for supplying energy to the electricity utilization end when the output power of the renewable energy unit cannot meet the demand of the electricity utilization end; the method comprises the following steps: acquiring the load demand variation of the electricity utilization end and the load demand of the electricity utilization end; when the load demand is greater than the total output power of the renewable energy unit, determining a residual load demand exceeding the total output power of the renewable energy unit; determining carbon emission in the micro-grid system when power output is performed based on the non-renewable energy unit and an external power grid based on the residual load demand; determining the total cost when the output power of the micro-grid system meets the load demand of the electricity utilization end based on the load demand of the electricity utilization end, the load demand variation of the electricity utilization end and the residual load demand; and determining the running mode of the micro-grid system meeting the user requirements according to the carbon emission and the total cost.
Optionally, the obtaining the load requirement of the electricity consumption end includes: determining the load demand change quantity of the electricity utilization end based on a demand response strategy; and calculating the load demand of the electricity consumption end after participating in the demand response strategy based on the determined load demand variation quantity of the electricity consumption end.
Optionally, the determining the total cost when the output power of the micro-grid system meets the load demand of the electricity consumption end based on the load demand of the electricity consumption end, the load demand variation of the electricity consumption end and the residual load demand includes: calculating the load demand response subsidy cost of the electricity consumption end based on the load demand variation quantity of the electricity consumption end; calculating the running cost, the carbon transaction cost, the non-renewable energy unit output electric power cost and the external power grid output electric power cost of a renewable energy unit and an energy storage unit in a micro-grid system based on the load demand of the power utilization end and the residual load demand; the total cost of the micro-grid system is determined based on the electrical end load demand response subsidy cost, the operating cost, the carbon trade cost, the non-renewable energy unit output electrical power cost, and the external grid output electrical power cost.
Optionally, the renewable energy unit comprises a wind turbine unit and a photovoltaic unit, the non-renewable energy unit comprises a gas turbine, the energy storage unit comprises an electrochemical energy storage unit, and the total cost of the micro-grid system is determined by the following formula:
f 1 ＝f m +C c ；
Wherein f 1 Representing the total cost of the microgrid system; f (f) m Representing the cost of the micro-grid system to output electrical power that meets the electrical end load demand; c (C) wt The cost of the output unit electric power of the wind turbine generator is represented; c (C) pv Representing the cost of the output unit electric power of the photovoltaic unit; c (C) fuel Cost representing the consumption of natural gas per unit of gas turbine; c (C) ees Representing the operation cost of the output unit power of the electrochemical energy storage unit; c (C) out-gird Representing the electricity price of the unit electric power output by the external power grid; c (C) DR C represents the cost of the electric end load demand response patch DR ＝c dr ·ΔQ e (t)；c dr The price of the unit load subsidy is responded to the electricity consumption end demand; ΔQ e (t) represents the load variation of the power utilization end; c (C) in-gird Representing electricity prices for selling units of electric power to an external grid; q (Q) wt (t) represents the electric power output in unit time of the wind turbine generator; q (Q) pv (t) represents the electric power output per unit time of the photovoltaic unit; f (F) fuel (t) natural gas amount representing output electric power consumption per unit time of gas turbine, F fuel (t)＝a e (Q fuel (t)) 2 +b e Q fuel (t)+c e ；Q fuel (t) represents the electric power output per unit time of the gas turbine; a, a e ,b e ,c e The fuel consumption coefficient of the gas turbine; e (E) ees Representing the power consumed by the operation of the electrochemical energy storage unit; q (Q) out-gird (t) represents the electric power output per unit time of the external power grid; q (Q) in-gird (t) represents the electric power sold to the external grid per unit time; t represents unit time, and T represents total working duration of the micro-grid; c (C) c Representing the cost of carbon trade.
Optionally, the determining, based on the residual load requirement, the carbon emission amount when the power output is performed based on the non-renewable energy unit and the external power grid in the micro-grid system includes: based on the residual load demand, respectively changing the electric power output by the gas turbine and the electric power output by the external power grid so that the electric power output by the gas turbine and the external power grid meets the residual load demand; based on the electric power output by the gas turbine and the electric power output by the external grid, the carbon emission amount of the micro grid system is calculated by the following formula:
wherein f 2 Representing the carbon emission of the micro-grid system;carbon emissions representing output unit electric power of the gas turbine; />Representing the carbon emission amount of the unit electric power output by the external power grid; q (Q) fuel (t) represents the electric power output per unit time of the gas turbine; q (Q) out-gird (t) represents the electric power output per unit time of the external power grid; t represents unit time, and T represents total working duration of the micro-grid system.
Optionally, determining a running mode of the micro-grid system meeting the requirements of the user according to the carbon emission and the total cost; comprising the following steps: establishing an optimal solution set based on the values of a plurality of carbon emission amounts of the micro-grid system and the corresponding total cost of the micro-grid system, wherein the optimal solution set represents a plurality of micro-grid system operation modes formed by different carbon emission amounts and corresponding total cost of the micro-grid system; and determining the running mode of the micro-grid system meeting the user requirements based on the established optimal solution set.
Optionally, determining a running mode of the micro-grid system meeting the user requirement based on the established optimal solution set; comprising the following steps: respectively calculating membership function values of a plurality of operation schemes corresponding to different carbon emission amounts of the micro-grid system in the optimal solution set and membership function values of a plurality of operation schemes corresponding to the total cost; determining a membership function value of each operation scheme based on the calculated membership function values of a plurality of operation schemes corresponding to different carbon emission amounts of the micro-grid system and the membership function values of a plurality of operation schemes corresponding to the total cost; and determining an optimal solution in the optimal solution set based on the determined membership function values of the operation schemes, wherein the optimal solution represents the operation mode of the micro-grid system meeting the user requirements.
According to a second aspect, the embodiment of the invention also discloses a device for determining the running mode of the micro-grid system containing electrochemical energy storage, wherein the micro-grid system comprises: the system comprises an external power grid, a renewable energy unit, a non-renewable energy unit, an energy storage unit and an electricity utilization end; the renewable energy unit is used for supplying energy to the electricity utilization end, and the non-renewable energy unit and the external power grid are used for supplying energy to the electricity utilization end when the output power of the renewable energy unit cannot meet the demand of the electricity utilization end; comprising the following steps: the load demand acquisition module is used for acquiring the load demand variation of the electricity utilization end and the load demand of the electricity utilization end; the residual load demand determining module is used for determining the residual load demand exceeding the total output power of the renewable energy unit when the load demand is larger than the total output power of the renewable energy unit; the carbon emission determining module is used for determining carbon emission when the non-renewable energy unit and an external power grid carry out different power output when the load demand of the power utilization end is met in the micro-grid system based on the residual load demand; the cost determining module is used for determining the total cost when the output power of the micro-grid system under different carbon emission meets the load demand of the electricity utilization end based on the load demand of the electricity utilization end, the load demand variation of the electricity utilization end and the residual load demand; and the operation mode determining module is used for determining the operation mode of the micro-grid system meeting the requirements of users according to the carbon emission and the total cost.
According to a third aspect, an embodiment of the present invention further discloses an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the steps of the method for determining a mode of operation of a microgrid system comprising electrochemical storage according to the first aspect or any of the alternative embodiments of the first aspect.
According to a fourth aspect, the embodiment of the present invention further discloses a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the steps of the method for determining the running mode of a micro grid system comprising electrochemical energy storage according to the first aspect or any optional embodiment of the first aspect.
The technical scheme of the invention has the following advantages:
according to the method for determining the running mode of the micro-grid system containing the electrochemical energy storage, the load demand variation of the electricity utilization end and the load demand of the electricity utilization end are obtained, when the load demand is larger than the total output power of the renewable energy unit, the residual load demand exceeding the total output power of the renewable energy unit is determined, the carbon emission amount of the micro-grid system when power output is carried out on the basis of the non-renewable energy unit and an external power grid is determined on the basis of the residual load demand, the total cost of the micro-grid system when the output power of the micro-grid system meets the load demand of the electricity utilization end is determined on the basis of the load demand of the electricity utilization end, the running mode of the micro-grid system meeting the user demand is determined according to the carbon emission amount and the total cost, and the running mode of the micro-grid system is determined by taking the strategy of the carbon emission and the running cost into consideration, so that the influence on the environment in the running process of the micro-grid system is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a specific example of a method for determining the operation mode of a micro-grid system including electrochemical energy storage according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a specific example of a method for determining an operation mode of a micro-grid system including electrochemical energy storage according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a specific example of a method for determining an operation mode of a micro-grid system including electrochemical energy storage according to an embodiment of the present invention;
FIG. 4 is a schematic block diagram of a specific example of a device for determining the operation mode of a micro-grid system including electrochemical energy storage according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment of the invention discloses a method for determining the running mode of a micro-grid system containing electrochemical energy storage, which comprises the following steps: the system comprises an external power grid, a renewable energy unit, a non-renewable energy unit, an energy storage unit and an electricity utilization end; the renewable energy unit is used for supplying energy to the electricity utilization end, and in the embodiment of the application, a wind turbine unit and a photovoltaic unit are taken as examples of the renewable energy unit; the non-renewable energy unit and the external power grid are used for supplying energy to an electricity utilization end when the output power of the renewable energy unit cannot meet the demand of the electricity utilization end, and in the embodiment of the application, the non-renewable energy unit takes a gas turbine as an example; in the embodiment of the application, in the running process of the micro-grid system, when the electric power output by the renewable energy unit is greater than the demand of an electricity utilization end, surplus electric power can be sold to an external power grid, the system income is increased, the system emission is reduced, when the electric power output by the renewable energy unit is less than the demand of a load, the electric power can be obtained from the external power grid or generated through a gas turbine to meet the demand of the load of the electricity utilization end, the reliability of the micro-grid system can be improved, the energy storage unit can store and release the electric energy through absorbing the abandoned wind and the abandoned light energy at the time of electricity utilization peak, the absorption rate of new energy can be improved, and the renewable energy unit can be the energy without carbon emission during the power generation by way of example only; as shown in fig. 1, the method comprises the steps of:
Step 101, acquiring the load demand variation of an electricity utilization end and the load demand of the electricity utilization end; the load demand change amount of the electricity consumption end can be the change of the load demand caused by the fact that a user adjusts the number of the electric equipment according to the electricity price floating result, for example, if the electricity price of the electricity consumption end is increased, the electricity consumption end can be guided to adjust the load demand, and the electricity consumption amount is reduced; or the normal life basic load demand of the electricity utilization end can be considered, the load demand of the electricity utilization end is passively reduced through artificial experience based on the electricity utilization data of the historical electricity utilization end, the load demand variation of the electricity utilization end is obtained, and the load demand of the electricity utilization end after the load demand is reduced is obtained, which is only taken as an example.
Step 102, when the load demand is greater than the total output power of the renewable energy unit, determining a residual load demand exceeding the total output power of the renewable energy unit;
in an exemplary embodiment of the present application, after obtaining the load demand of the power consumer, the renewable energy unit operates to output electric power, and determines whether the electric power output by the renewable energy unit in total meets the load demand of the power consumer, if so, only the renewable energy unit is required to operate to output electric power, and if the load demand of the power consumer is greater than the total output power of the renewable energy unit, it is determined how much load demand is required to meet the load demand of the power consumer, which is merely taken as an example.
Step 103, determining carbon emission amounts of a non-renewable energy unit and an external power grid when different power outputs are carried out when the load demands of the power utilization end are met in the micro-grid system based on the residual load demands;
in the embodiment of the application, after determining how much load demand is required to meet the load demand of the electricity consuming end, the electricity power may be directly obtained from the external power grid or the natural gas may be combusted by using a gas turbine to output the electricity power, and the carbon emission may be generated in a manner of both the output electricity powers. Based on the residual load demand, under the condition of meeting the residual load demand of the electricity utilization end, the non-renewable energy source unit and the external power grid can have a plurality of different output schemes, and the different output schemes can correspond to different carbon emission amounts
Step 104, determining the total cost when the output power of the micro-grid system under different carbon emission meets the load demand of the electricity utilization end based on the load demand of the electricity utilization end, the load demand variation of the electricity utilization end and the residual load demand; illustratively, the total cost of running the micro-grid system in the embodiment of the present application includes the labor cost of the renewable energy units and the non-renewable energy units in the micro-grid system in the process of outputting electric power, the cost of unit maintenance, the consumption cost of the output electric power, and the like, the subsidy cost of the leading electric terminal for reducing the load demand, the cost of purchasing the electric power, and the like, which are only used as examples, specific cost types and different types of cost calculation modes, and the embodiment of the present application is not limited, and a person skilled in the art can determine the cost types to be calculated and the corresponding cost calculation modes according to the actual situation.
And 105, determining the running mode of the micro-grid system meeting the requirements of the user according to the carbon emission and the total cost. By way of example, the micro-grid system according to the embodiment of the present application may output electric power to meet the load demand of the electricity end based on different operation modes, where the different operation modes correspond to different carbon emission amounts and different total costs, and may display, at the user terminal, the carbon emission amounts and the total costs corresponding to multiple operation modes (i.e. schemes how different units exert forces) that meet the load demand of the user, so that the user may select a suitable operation mode of the micro-grid system in combination with the self-demand situation, such as, for example, the user selects an operation mode that corresponds to the minimum carbon emission amount for environmental protection, and may also select an operation mode that corresponds to the minimum total costs for economical efficiency.
According to the method for determining the running mode of the micro-grid system containing the electrochemical energy storage, the load demand variation of the electricity utilization end and the load demand of the electricity utilization end are obtained, when the load demand is larger than the total output power of the renewable energy unit, the residual load demand exceeding the total output power of the renewable energy unit is determined, the carbon emission amount of the micro-grid system when power output is carried out on the basis of the non-renewable energy unit and an external power grid is determined on the basis of the residual load demand, the total cost of the micro-grid system when the output power of the micro-grid system meets the load demand of the electricity utilization end is determined on the basis of the load demand of the electricity utilization end, the running mode of the micro-grid system meeting the user demand is determined according to the carbon emission amount and the total cost, and the running mode of the micro-grid system is determined by taking the strategy of the carbon emission and the running cost into consideration, so that the influence on the environment in the running process of the micro-grid system is reduced.
As an optional embodiment of the present invention, the obtaining the load requirement of the electricity consumption terminal includes: determining the load demand change quantity of the electricity utilization end based on a demand response strategy; and calculating the load demand of the electricity consumption end after participating in the demand response strategy based on the determined load demand variation quantity of the electricity consumption end.
In an exemplary embodiment of the present application, when the load demand of the electricity consumption end is obtained, a price type demand response policy may be considered, the electricity consumption end is guided to adjust the electricity consumption behavior, and an electric quantity and electricity price elastic matrix method may be adopted to adjust the load demand of the electricity consumption end after participating in the demand response policy, for example, the load demand of the micro grid system after participating in the demand response policy is calculated by the following formula:
wherein Q is e (t) representing the load demand of the electricity end after the demand response strategy is considered; q (Q) e,0 (t) represents the load demand before the electricity utilization side considers the demand response strategy; ΔQ e (t) represents a load demand variation amount; lambda represents the ratio of electricity price to electric quantity,delta q and delta p are the variation of the electric quantity q and the electric price p respectively; t represents time t.
As an optional embodiment of the present invention, the determining, based on the load requirement of the electricity consumer, the load requirement variation of the electricity consumer, and the residual load requirement, the total cost when the output power of the micro-grid system meets the load requirement of the electricity consumer includes: calculating the load demand response subsidy cost of the electricity consumption end based on the load demand variation quantity of the electricity consumption end; calculating the running cost, carbon transaction cost, non-renewable energy unit output electric power cost and external power grid output electric power cost of a renewable energy unit and an energy storage unit in a micro-grid system under different carbon emission based on the load demand of the power utilization end and the residual load demand; the total cost of the micro-grid system is determined based on the electrical end load demand response subsidy cost, the operating cost, the carbon trade cost, the non-renewable energy unit output electrical power cost, and the external grid output electrical power cost.
The electric power consumption end load demand response subsidy cost is generated when the load demand is reduced, if the load demand of the electric power consumption end is not reduced, the electric power consumption end load demand response subsidy cost is zero, the load demand reduction degree is different, different subsidy costs can be corresponding, specifically, the load demand reduction conditions of different degrees can be matched with the corresponding subsidy costs and stored, then the load demand reduction degree of the electric power consumption end is determined according to the obtained current load demand variation of the electric power consumption end, and the electric power consumption end load demand response subsidy cost corresponding to the current load demand variation of the electric power consumption end can be obtained through comparison with stored data.
Based on the load demand of the electricity utilization end and the residual load demand, the renewable energy units and the non-renewable energy units in the micro-grid system and the external power grid output electric power to meet the load demand of the electricity utilization end, and the energy storage system provides an energy storage supporting function for the micro-grid system, so that the operation cost of the renewable energy units and the energy storage units in the micro-grid system, the output electric power cost of the non-renewable energy units and the output electric power cost of the external power grid need to be calculated, the operation cost can include, but is not limited to, maintenance cost of the units, power generation investment cost, energy storage system cost or infrastructure construction cost and the like, and the output electric power cost can be the cost of natural gas consumption of a gas turbine, the cost of obtaining electric power to the external power grid and the like, and the output electric power cost is only used as an example; the carbon emission amount generated by the micro-grid in the operation process cannot exceed the specified carbon emission quota, if the carbon emission requirement of the micro-grid system cannot be met, the carbon transaction amount can be purchased, so that the carbon transaction cost needs to be calculated, and the total cost of the micro-grid system is determined based on the electricity end load requirement response subsidy cost, the operation cost, the carbon transaction cost, the non-renewable energy unit output electric power cost and the external power grid output electric power cost.
In this embodiment of the present application, the renewable energy unit may include a wind turbine unit and a photovoltaic unit, which is only used as an example, after obtaining the carbon emission quota of the micro-grid system, calculate the carbon emission amount generated after the micro-grid system outputs the electric power meeting the load requirement of the electricity consumption end, compare the carbon emission amount with the carbon emission quota, if the carbon emission quota is exceeded, purchase the corresponding carbon emission transaction amount is needed, if the generated carbon emission amount is less than the carbon emission quota, sell the carbon emission transaction amount, so as to reduce the running cost of the micro-grid system, and the carbon transaction cost may be calculated by adopting a step-type carbon transaction manner, for example, calculate the free carbon emission quota of the micro-grid system by the following formula:
wherein Q is free Free carbon emission quota for micro grid systems; alpha is the unit electric power emission quota; t is a carbon transaction settlement period; q (Q) wt (t) represents the electric power output in unit time of the wind turbine generator; q (Q) pv (t) represents the electric power output per unit time of the photovoltaic unit; q (Q) e (t) represents the electric power output per unit time of the external power grid; q (Q) gas (t) represents the electric power output per unit time of the non-renewable energy unit; t represents unit time, and T represents total working time of the micro-grid system; η (eta) gas,e Is the gas turbine gas-to-electricity efficiency.
The carbon trade cost is calculated by:
wherein C is c Representing carbon trade costs; l represents the difference between the actual carbon emission amount and the free carbon emission allowance; beta represents the price increase amplitude of the carbon trade; c ce Representing the cost required for a unit carbon transaction; q (Q) actul Representing carbon emissions generated by operation of the micro-grid system; q (Q) free Represents a free carbon emission quota for the microgrid.
As an alternative embodiment of the present invention, the renewable energy unit includes a wind turbine unit and a photovoltaic unit, the non-renewable energy unit includes a gas turbine, the energy storage unit includes an electrochemical energy storage unit, and the total cost of the micro-grid system is determined by the following formula:
f 1 ＝f m +C c ；
wherein f 1 Representing the total cost of the microgrid system; f (f) m Representing the cost of the micro-grid system to output electrical power that meets the electrical end load demand; c (C) wt The cost of the output unit electric power of the wind turbine generator is represented; c (C) pv Representing the cost of the output unit electric power of the photovoltaic unit; c (C) fuel Cost representing the consumption of natural gas per unit of gas turbine; c (C) ees Representing the operation cost of the output unit power of the electrochemical energy storage unit; c (C) out-gird Representing the electricity price of the unit electric power output by the external power grid; c (C) DR C represents the cost of the electric end load demand response patch DR ＝c dr ·ΔQ e (t)；c dr The price of the unit load subsidy is responded to the electricity consumption end demand; ΔQ e (t) represents the load variation of the power utilization end; c (C) in-gird Representing electricity prices for selling units of electric power to an external grid; q (Q) wt (t) represents the electric power output in unit time of the wind turbine generator; q (Q) pv (t) represents the electric power output per unit time of the photovoltaic unit; f (F) fuel (t) natural gas amount representing output electric power consumption per unit time of gas turbine, F fuel (t)＝a e (Q fuel (t)) 2 +b e Q fuel (t)+c e ；Q fuel (t) represents the electric power output per unit time of the gas turbine; a, a e ,b e ,c e For the gas turbine burnup coefficient, the value is generally determined by the manufacturer of the unit according to the actual situation. E (E) ees Representing the rated capacity of the electrochemical energy storage unit; q (Q) out-gird (t) represents the electrical power output by the external grid; q (Q) in-gird (t) represents electric power sold to an external electric grid; t represents unit time, and T represents total working time of the micro-grid system; c (C) c Representing the cost of carbon trade.
In the embodiment of the application, the electrochemical energy storage unit is an important device for running the micro-grid system, and the state of charge of the electrochemical energy storage unit is calculated through the following formula:
wherein, the liquid crystal display device comprises a liquid crystal display device,the charge state of the electrochemical energy storage unit at the time t+1 is represented; />The state of charge of the electrochemical energy storage unit at the time t is represented; epsilon ees Representing the self-loss rate of the electrochemical energy storage device and; / >Respectively representing the charging power and the discharging power of the electrochemical energy storage unit at the time t; />Respectively representing the charge and discharge efficiency of the electrochemical energy storage unit, E ees Representing the rated capacity of the electrochemical energy storage unit; Δt is a scheduling duration, and in the embodiment of the present application, the scheduling duration is selected to be 1h.
As an optional embodiment of the present invention, the determining, based on the residual load requirement, a carbon emission amount in the micro-grid system when power output is performed based on the non-renewable energy unit and an external power grid includes: based on the residual load demand, respectively changing the electric power output by the gas turbine and the electric power output by the external power grid so that the electric power output by the gas turbine and the external power grid meets the residual load demand; based on the electric power output by the gas turbine and the electric power output by the external grid, the carbon emission amount of the micro grid system is calculated by the following formula:
wherein f 2 Representing the carbon emission of the micro-grid system;carbon emissions representing output unit electric power of the gas turbine; />Carbon emissions representing the electrical power output by the external grid; q (Q) fuel (t) represents the electric power output per unit time of the gas turbine; q (Q) out-gird (t) represents the electric power output per unit time of the external power grid; t represents the total working time of the micro-grid system in unit time.
As an optional implementation manner of the invention, the running mode of the micro-grid system meeting the requirement of the user is determined according to the carbon emission and the total cost; comprising the following steps: establishing an optimal solution set based on the values of a plurality of carbon emission amounts of the micro-grid system and the corresponding total cost of the micro-grid system, wherein the optimal solution set represents a plurality of micro-grid system operation modes formed by different carbon emission amounts and corresponding total cost of the micro-grid system; and determining the running mode of the micro-grid system meeting the user requirements based on the established optimal solution set.
In an exemplary embodiment of the present application, the value of the carbon emission amount of the micro-grid system is changed by changing the electric power output by the gas turbine and the electric power output by the external power grid, the generated carbon emission amounts may cause different carbon trading costs, and meanwhile, the electric power output by the gas turbine and the electric power output by the external power grid may also have different costs, so that the value of any carbon emission amount corresponds to the value of one micro-grid system total cost, the value of one carbon emission amount and the value of the corresponding one micro-grid system total cost form a micro-grid system operation scheme, an optimal solution set of the micro-grid system is constructed by the following formula, and based on the established optimal solution set, a user may select a micro-grid system operation mode meeting the requirements according to the actual situation:
f 1 ＝f m +C c
Wherein delta represents f 2 The constraint conditions include the following:
in the running process of the micro-grid system, the constraint conditions of the output electric power of the wind turbine generator and the photovoltaic turbine generator are as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,the method respectively represents the lower limit of the output electric power of the wind turbine, the upper limit of the output electric power of the wind turbine, the lower limit of the output electric power of the photovoltaic unit and the upper limit of the output electric power of the photovoltaic unit.
In the running process of the micro-grid system, the constraint condition of the output electric power of the gas turbine is as follows:
|Q fuel (t)-Q fuel (t-1)|≤ΔQ fuel
wherein, the liquid crystal display device comprises a liquid crystal display device,representing an upper limit of the output electric power of the gas turbine; ΔQ fuel The up-down ramp rate per unit time of the gas turbine is shown.
In the running process of the micro-grid system, the electrochemical energy storage unit has charge and discharge characteristics, and in order to prevent excessive consumption, the following constraint conditions are satisfied:
wherein, the liquid crystal display device comprises a liquid crystal display device,indicating the maximum charge/discharge power of the electrochemical energy storage unit at time t +.>Respectively representing the minimum and maximum charge states of the electrochemical energy storage unit; />The charge and discharge of the electrochemical energy storage unit t at the moment are respectively; />A variable representing the charging state of the electrochemical energy storage unit, wherein a value of 0 represents that the electrochemical energy storage unit is not charged, and a value of 1 represents that the electrochemical energy storage unit is charged; / >And the variable representing the discharge state of the electrochemical energy storage unit is 0, the electrochemical energy storage unit does not discharge, and the variable representing the discharge state of the electrochemical energy storage unit is 1.
The micro-grid system is connected with an external power grid, when the electric power output by the renewable energy source unit of the micro-grid system meets the load demand of the electricity utilization end, the selling electric power to the external power grid obtains benefits, and when the electric power output by the renewable energy source unit of the micro-grid system meets the load demand of the electricity utilization end, the electric power is purchased from the external power grid, and specific constraint conditions are as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,represented as upper power limits for the micro grid system to purchase and sell electrical power to the external grid, respectively.
When the micro-grid system guides the electricity utilization end to adjust electricity utilization behaviors, specific constraint conditions of the load demand variable quantity and the electricity price variable value are as follows:
|ΔQ e (t)|≤ΔQ max
Δp min ≤Δp(t)≤Δp max
wherein DeltaQ max Representing the maximum variation of the load demand after the demand response; Δp min 、Δp max Respectively representing the minimum and maximum response amounts of electricity prices; Δp (t) is a change value of the corresponding electricity rate in the t period. .
Constraints on electric power balance during operation of the micro grid system are as follows:
according to the method and the device, as a specific embodiment of the method, the Pareto optimal solution set is obtained through solving through an Epsilon constraint method, the Pareto optimal solution set can be obtained through converting one target in total cost or carbon emission into constraint based on solving through the Epsilon constraint method, the problem of local optimum can be avoided, and the optimal solution set corresponding to the double targets can be accurately found.
As an optional implementation manner of the invention, the running mode of the micro-grid system meeting the user requirement is determined based on the established optimal solution set; comprising the following steps: respectively calculating different carbon emission amounts of the micro-grid system in the optimal solution and membership function values of a plurality of operation schemes corresponding to the total cost; determining a membership function value of each operation scheme based on the calculated membership function values of a plurality of operation schemes corresponding to different carbon emission amounts of the micro-grid system and the membership function values of a plurality of operation schemes corresponding to the total cost; and determining an optimal solution in the optimal solution set based on the determined membership function values of the operation schemes, wherein the optimal solution represents the operation mode of the micro-grid system meeting the user requirements.
By way of example, after the Pareto optimal solution set is obtained, the embodiment of the application calls the CPLEX pair conversion model in the MATLAB environment by using the fuzzy decision method to obtain the optimal solution set from the Pareto solution set, so that the efficiency of finding the optimal solution can be improved, and the fuzzy membership function values of a plurality of operation schemes corresponding to different carbon emission amounts and the total cost of the micro grid system in the optimal solution set are respectively calculated by the following formula:
Wherein, the liquid crystal display device comprises a liquid crystal display device,a fuzzy membership degree of a jth operation scheme representing a kth target; k represents a kth target; j represents a j-th operation scheme; />Representing the maximum value of the kth target in the optimal solution set; />Representing the minimum value of the kth target in the optimal solution set; />A value representing a jth operating scheme of a kth target; the objectives in embodiments of the present application include the amount of carbon emissions and the total cost of the micro-grid system.
The membership function value for each operating scheme is selected by:
the optimal solution is selected by:
wherein N is 0 Representing the number of optimal solution sets.
As a specific embodiment of the invention, in order to verify the effectiveness and the practicability of the application, the micro-grid system of a certain park in the south is taken as an example to perform operation optimization, the time scale is 1h, and CPLEX is called to perform solving in a MATLAB environment. Parameters of wind power, photovoltaic, internal combustion generator and electrochemical energy storage unit configured in the park are shown in table 1, predicted values of wind power, photovoltaic output and load are shown in figure 2, and cost coefficient a of the internal combustion generator unit is shown in table 1 e 、b e 、c e 0.0013, 0.160, 0, respectively. The electricity purchase price of the micro-grid is shown in Table 2, the price elastic coefficient is shown in Table 3, the natural gas purchase price is 0.25 yuan/kWh, and the carbon trade price is 0.2576 yuan/kg. And 1 yuan is subsidized every 1kW.h when a user participates in demand response load transfer, the thermal power duty ratio coefficient in the electric power purchased from the large power grid is 100%, and the upper limit and the lower limit power of the micro power grid for purchasing and selling electricity to the large power grid are 1000kW.
TABLE 1 Main Equipment parameters
Table 2 price parameters of microgrid
TABLE 3 self-elasticity and Cross-elasticity for peak, flat, valley time periods
In order to verify the effectiveness of the micro-grid in participating in the electric-carbon market, four scenes shown in table 4 are set to simulate the running conditions before and after the micro-grid participates in the electric-carbon market, and the influence of a demand response subsidy mechanism and a reference carbon trade price mechanism on the running economy and environmental protection of the micro-grid is researched.
TABLE 4 scene division
In the embodiment of the application, "x" represents that the total cost and the carbon emission are calculated without considering the corresponding mechanism, and "v" represents that the total cost and the carbon emission are calculated with considering the corresponding mechanism, and comparing the results of the scene 1 and the scene 2, it can be known that after the demand response strategy is implemented, the user reduces the electricity consumption in the peak period for reducing the electricity consumption cost, and reduces the electricity generation cost, the electricity purchasing cost and the carbon emission of the micro-grid system; comparing the results of the scene 1 and the scene 3, it can be known that after the stepwise carbon transaction mechanism is implemented, the carbon emission amount generated by the micro-grid system is counted into the carbon transaction cost, the total system cost of the micro-grid is increased, but the total carbon emission amount of the system is also obviously reduced; comparing the results of the scene 2 and the scene 3, compared with the ladder-type carbon transaction mechanism, the implementation of the demand response strategy is more beneficial to the reduction of the carbon emission; therefore, compared with the first three scenes, the scene 4 is the lowest in carbon emission and has less influence on the running economy of the micro-grid system, and the implementation of the stepped carbon transaction mechanism and the demand response strategy can ensure the economic benefit and the environmental benefit of the micro-grid system at the same time.
According to the embodiment of the application, the carbon emission and the total cost of the micro-grid under the stepped carbon transaction mechanism and the traditional carbon transaction mechanism are calculated respectively, so that the influence of the implementation of the stepped carbon transaction on the running economy and the environmental protection of the micro-grid is analyzed.
TABLE 5 transaction costs and operating profits under different carbon transaction mechanisms
As can be seen from fig. 3 and table 5, although implementation of the stepped carbon trade mechanism significantly increases the carbon trade cost, such that the total cost of the micro-grid increases, the total amount of carbon emissions from the micro-grid is correspondingly reduced. From this, it can be seen that if the intensity of the unit carbon emission of the internal combustion generator set can be reduced by the equipment modification, or by purchasing green electric power, the total carbon emission amount and the carbon transaction cost can be reduced at the same time, and even the carbon transaction cost can be converted into carbon transaction benefit, thereby improving the economical efficiency and environmental protection of the system operation.
The embodiment of the invention also discloses a device for determining the running mode of the micro-grid system containing electrochemical energy storage, and the micro-grid system comprises: the system comprises an external power grid, a renewable energy unit, a non-renewable energy unit, an energy storage unit and an electricity utilization end; the renewable energy unit is used for supplying energy to the electricity utilization end, and the non-renewable energy unit and the external power grid are used for supplying energy to the electricity utilization end when the output power of the renewable energy unit cannot meet the demand of the electricity utilization end; as shown in fig. 4, the apparatus includes:
The load demand acquisition module 201 is configured to acquire a load demand variation of the electricity consumption terminal and a load demand of the electricity consumption terminal;
a residual load demand determining module 202, configured to determine a residual load demand exceeding the total output power of the renewable energy unit when the load demand is greater than the total output power of the renewable energy unit;
a carbon emission determining module 203, configured to determine, based on the residual load requirement, carbon emission when the renewable energy unit and the external power grid perform different power output when the load requirement of the power utilization end is satisfied in the micro-grid system;
a cost determining module 204, configured to determine, based on a load requirement of the electricity consumer, a load requirement variation of the electricity consumer, and the residual load requirement, a total cost when the output power of the micro-grid system under different carbon emissions meets the load requirement of the electricity consumer;
the operation mode determining module 205 is configured to determine, according to the carbon emission amount and the total cost, an operation mode of the micro grid system that meets a requirement of a user.
The invention provides an operation mode determining device of a micro-grid system containing electrochemical energy storage, which is used for acquiring a load demand variation of an electricity utilization end and a load demand of the electricity utilization end, determining a residual load demand exceeding the total output power of a renewable energy unit when the load demand is larger than the total output power of the renewable energy unit, determining a carbon emission amount in the micro-grid system when power is output based on a non-renewable energy unit and an external power grid based on the residual load demand, determining the total cost when the output power of the micro-grid system meets the load demand of the electricity utilization end based on the load demand of the electricity utilization end, the load demand variation of the electricity utilization end and the residual load demand, determining the operation mode of the micro-grid system meeting the user demand according to the carbon emission amount and the total cost, and determining the operation mode of the micro-grid system by taking the strategies of carbon emission and operation cost into consideration, so as to reduce the operation cost of the micro-grid system and reduce the influence on the environment in the operation process.
As an alternative embodiment of the present invention, the load demand acquisition module includes: the demand change amount determination submodule is used for determining the load demand change amount of the electricity utilization end based on a demand response strategy; and the load demand calculation sub-module is used for calculating the load demand of the electricity consumption end after participating in the demand response strategy based on the determined load demand variation of the electricity consumption end.
As an alternative embodiment of the present invention, the cost determining module includes: the response subsidy cost determination submodule is used for calculating the load demand response subsidy cost of the electricity consumption end based on the load demand variation of the electricity consumption end; the running cost determining submodule is used for calculating running cost, carbon transaction cost, non-renewable energy unit output electric power cost and external power grid output electric power cost of a renewable energy unit and an energy storage unit in the micro-grid system under different carbon emission based on the load demand of the power utilization end and the residual load demand; the total cost determination sub-module is used for determining the total cost of the micro-grid system based on the electricity end load demand response subsidy cost, the operation cost, the carbon trade cost, the non-renewable energy unit output electric power cost and the external grid output electric power cost.
As an alternative embodiment of the present invention, the renewable energy unit includes a wind turbine unit and a photovoltaic unit, the non-renewable energy unit includes a gas turbine, the energy storage unit includes an electrochemical energy storage unit, and the total cost of the micro-grid system is determined by the following formula:
f 1 ＝f m +C c ；
wherein f 1 Representing the total cost of the microgrid system; f (f) m Representing the cost of the micro-grid system to output electrical power that meets the electrical end load demand; c (C) wt The cost of the output unit electric power of the wind turbine generator is represented; c (C) pv Representing the cost of the output unit electric power of the photovoltaic unit; c (C) fuel Cost representing the consumption of natural gas per unit of gas turbine; c (C) ees Representing the operation cost of the output unit power of the electrochemical energy storage unit; c (C) out-gird Representing the electricity price of the unit electric power output by the external power grid; c (C) DR C represents the cost of the electric end load demand response patch DR ＝c dr ·ΔQ e (t)；c dr The price of the unit load subsidy is responded to the electricity consumption end demand; ΔQ e (t) represents the load variation of the power utilization end; c (C) in-gird Representing electricity prices for selling units of electric power to an external grid; q (Q) wt (t) represents the electric power output in unit time of the wind turbine generator; q (Q) pv (t) represents the electric power output per unit time of the photovoltaic unit; f (F) fuel (t) natural gas amount representing output electric power consumption per unit time of gas turbine, F fuel (t)＝a e (Q fuel (t)) 2 +b e Q fuel (t)+c e ；Q fuel (t) represents the electric power output per unit time of the gas turbine; a, a e ,b e ,c e Is the burnup coefficient of the gas turbine. E (E) ees Representing the power consumed by the operation of the electrochemical energy storage unit; q (Q) out-gird (t) represents the electric power output per unit time of the external power grid; q (Q) in-gird (t) represents the electric power sold to the external grid for a unit time; t represents unit time, and T represents total working time of the micro-grid system; c (C) c Representing the cost of carbon trade.
As an alternative embodiment of the present invention, a carbon emission amount determination module includes: an electric power changing sub-module for respectively changing electric power output by the gas turbine and electric power output by the external power grid based on the residual load demand so that the electric power output by the gas turbine and the external power grid satisfies the residual load demand; a carbon emission amount calculation operator module for calculating a carbon emission amount of the micro grid system based on the electric power output from the gas turbine and the electric power output from the external grid by:
wherein f 2 Representing the carbon emission of the micro-grid system;carbon emissions representing output unit electric power of the gas turbine; />Representing the carbon emission amount of the unit electric power output by the external power grid; q (Q) fuel (t) represents the electric power output per unit time of the gas turbine; q (Q) out-gird (t) represents the electric power output per unit time of the external power grid; t represents unit time, and T represents total working duration of the micro-grid system.
As an optional embodiment of the present invention, the operation mode determining module includes: an optimal solution set establishing module, configured to establish an optimal solution set based on values of a plurality of carbon emissions of the micro grid system and values of total costs of the corresponding micro grid system, where the optimal solution set represents a plurality of micro grid system operation modes formed by different carbon emissions and corresponding total costs of the micro grid system; the operation mode determining sub-module is used for determining the operation mode of the micro-grid system meeting the requirements of users based on the established optimal solution set.
As an alternative embodiment of the present invention, the operation mode determining submodule includes: a membership function value calculation sub-module for calculating membership function values of different carbon emission amounts of the micro-grid system in the optimal solution set and a plurality of operation schemes corresponding to the total cost respectively; the operation scheme membership function value determining submodule is used for determining the membership function value of each operation scheme based on the calculated membership function values of a plurality of operation schemes corresponding to different carbon emission amounts of the micro-grid system and the membership function values of a plurality of operation schemes corresponding to the total cost; the optimal solution determining sub-module is used for determining an optimal solution in the optimal solution set based on the determined membership function values of the operation schemes, and the optimal solution represents the operation mode of the micro-grid system meeting the user requirements.
The embodiment of the present invention further provides an electronic device, as shown in fig. 5, where the electronic device may include a processor 401 and a memory 402, where the processor 401 and the memory 402 may be connected by a bus or other means, and in fig. 5, the connection is exemplified by a bus.
The processor 401 may be a central processing unit (Central Processing Unit, CPU). The processor 401 may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 402 is used as a non-transitory computer readable storage medium, and can be used to store a non-transitory software program, a non-transitory computer executable program, and a module, such as program instructions/modules corresponding to the method for determining the operation mode of the micro-grid system with electrochemical energy storage according to the embodiment of the invention. The processor 401 executes the non-transitory software programs, instructions and modules stored in the memory 402 to perform various functional applications and data processing of the processor, i.e., to implement the method for determining the operating mode of the micro-grid system with electrochemical energy storage in the above-described method embodiment.
Memory 402 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created by the processor 401, or the like. In addition, memory 402 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 402 may optionally include memory located remotely from processor 401, such remote memory being connectable to processor 401 through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 402, which when executed by the processor 401, performs the method of determining how a microgrid system comprising electrochemical storage is operating in the embodiment as shown in fig. 1.
The specific details of the electronic device may be understood correspondingly with respect to the corresponding related descriptions and effects in the embodiment shown in fig. 1, which are not repeated herein.
It will be appreciated by those skilled in the art that implementing all or part of the above-described embodiment method may be implemented by a computer program to instruct related hardware, where the program may be stored in a computer readable storage medium, and the program may include the above-described embodiment method when executed. Wherein the storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a random access Memory (RandomAccessMemory, RAM), a Flash Memory (Flash Memory), a Hard Disk (HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope as defined.

Claims (10)

1. A method for determining an operating mode of a micro-grid system containing electrochemical energy storage, the micro-grid system comprising: the system comprises an external power grid, a renewable energy unit, a non-renewable energy unit, an energy storage unit and an electricity utilization end; the renewable energy unit is used for supplying energy to the electricity utilization end, and the non-renewable energy unit and the external power grid are used for supplying energy to the electricity utilization end when the output power of the renewable energy unit cannot meet the demand of the electricity utilization end; the method comprises the following steps:
acquiring the load demand variation of the electricity utilization end and the load demand of the electricity utilization end;
when the load demand is greater than the total output power of the renewable energy unit, determining a residual load demand exceeding the total output power of the renewable energy unit;
determining carbon emission amounts of a non-renewable energy unit and an external power grid when different power outputs are carried out when the load demands of an electricity utilization end are met in a micro-grid system based on the residual load demands;
Determining the total cost when the output power of the micro-grid system under different carbon emission meets the load demand of the electricity consumption end based on the load demand of the electricity consumption end, the load demand variation of the electricity consumption end and the residual load demand;
and determining the running mode of the micro-grid system meeting the user requirements according to the carbon emission and the total cost.
2. The method for determining an operation mode of a micro-grid system with electrochemical energy storage according to claim 1, wherein the obtaining the load demand of the electricity consumer comprises:
determining the load demand change quantity of the electricity utilization end based on a demand response strategy;
and calculating the load demand of the electricity consumption end after participating in the demand response strategy based on the determined load demand variation quantity of the electricity consumption end.
3. The method for determining an operation mode of a micro-grid system with electrochemical energy storage according to claim 1, wherein determining the total cost when the output power of the micro-grid system meets the load demand of the electricity consumption end based on the load demand of the electricity consumption end, the load demand variation of the electricity consumption end and the residual load demand comprises:
calculating the load demand response subsidy cost of the electricity consumption end based on the load demand variation quantity of the electricity consumption end;
Calculating the running cost, carbon transaction cost, non-renewable energy unit output electric power cost and external power grid output electric power cost of a renewable energy unit and an energy storage unit in a micro-grid system under different carbon emission based on the load demand of the power utilization end and the residual load demand;
the total cost of the micro-grid system is determined based on the electrical end load demand response subsidy cost, the operating cost, the carbon trade cost, the non-renewable energy unit output electrical power cost, and the external grid output electrical power cost.
4. The method of determining the operational mode of a micro-grid system with electrochemical energy storage according to claim 3, wherein the renewable energy units comprise wind power units and photovoltaic units, the non-renewable energy units comprise gas turbines, the energy storage units comprise electrochemical energy storage units, and the total cost of the micro-grid system is determined by:
f 1 ＝f m +C c ；
wherein f 1 Representing the total cost of the microgrid system; f (f) m Representing the cost of the micro-grid system to output electrical power that meets the electrical end load demand; c (C) wt The cost of the output unit electric power of the wind turbine generator is represented; c (C) pv Representing the cost of the output unit electric power of the photovoltaic unit; c (C) fuel Cost representing the consumption of natural gas per unit of gas turbine; c (C) ees Representing the operation cost of the output unit power of the electrochemical energy storage unit; c (C) out-gird Representing the electricity price of the unit electric power output by the external power grid; c (C) DR C represents the cost of the electric end load demand response patch DR ＝c dr ·ΔQ e (t)；c dr The price of the unit load subsidy is responded to the electricity consumption end demand; ΔQ e (t) represents the load variation of the power utilization end; c (C) in-gird Representing electricity prices for selling units of electric power to an external grid; q (Q) wt (t) represents the electric power output in unit time of the wind turbine generator; q (Q) pv (t) represents the output electricity per unit time of the photovoltaic unitA power; f (F) fuel (t) natural gas amount representing output electric power consumption per unit time of gas turbine, F fuel (t)＝a e (Q fuel (t)) 2 +b e Q fuel (t)+c e ；Q fuel (t) represents the electric power output per unit time of the gas turbine; a, a e ,b e ,c e The fuel consumption coefficient of the gas turbine; e (E) ees Representing the power consumed by the operation of the electrochemical energy storage unit; q (Q) out-gird (t) represents the electric power output per unit time of the external power grid; q (Q) in-gird (t) represents the electric power sold to the external grid per unit time; t represents unit time, and T represents total working duration of the micro-grid; c (C) c Representing the cost of carbon trade.
5. The method for determining the operation mode of the micro-grid system with electrochemical energy storage according to claim 1, wherein the determining the carbon emission amount of the micro-grid system when the power output is performed based on the non-renewable energy unit and the external power grid based on the residual load demand comprises:
Based on the residual load demand, respectively changing the electric power output by the gas turbine and the electric power output by the external power grid so that the electric power output by the gas turbine and the external power grid meets the residual load demand;
based on the electric power output by the gas turbine and the electric power output by the external grid, the carbon emission amount of the micro grid system is calculated by the following formula:
wherein f 2 Representing the carbon emission of the micro-grid system;carbon emissions representing output unit electric power of the gas turbine;representing the carbon emission amount of the unit electric power output by the external power grid; q (Q) fuel (t) represents the electric power output per unit time of the gas turbine; q (Q) out-gird (t) represents the electric power output per unit time of the external power grid; t represents unit time, and T represents total working duration of the micro-grid system.
6. The method for determining the operation mode of a micro-grid system containing electrochemical energy storage according to any one of claims 1 to 5, wherein the operation mode of the micro-grid system meeting the requirements of users is determined according to the carbon emission amount and the total cost; comprising the following steps:
establishing an optimal solution set based on the values of a plurality of carbon emission amounts of the micro-grid system and the corresponding total cost of the micro-grid system, wherein the optimal solution set represents a plurality of micro-grid system operation modes formed by different carbon emission amounts and corresponding total cost of the micro-grid system;
And determining the running mode of the micro-grid system meeting the user requirements based on the established optimal solution set.
7. The method of claim 6, wherein the determining the micro grid system operation mode satisfying the user demand is based on the established optimal solution set; comprising the following steps:
respectively calculating membership function values of a plurality of operation schemes corresponding to different carbon emission amounts of the micro-grid system in the optimal solution set and membership function values of a plurality of operation schemes corresponding to the total cost;
determining a membership function value of each operation scheme based on the calculated membership function values of a plurality of operation schemes corresponding to different carbon emission amounts of the micro-grid system and the membership function values of a plurality of operation schemes corresponding to the total cost;
and determining an optimal solution in the optimal solution set based on the determined membership function values of the operation schemes, wherein the optimal solution represents the operation mode of the micro-grid system meeting the user requirements.
8. An operation mode determining device of a micro-grid system containing electrochemical energy storage, wherein the micro-grid system comprises: the system comprises an external power grid, a renewable energy unit, a non-renewable energy unit, an energy storage unit and an electricity utilization end; the renewable energy unit is used for supplying energy to the electricity utilization end, and the non-renewable energy unit and the external power grid are used for supplying energy to the electricity utilization end when the output power of the renewable energy unit cannot meet the demand of the electricity utilization end; comprising the following steps:
The load demand acquisition module is used for acquiring the load demand variation of the electricity utilization end and the load demand of the electricity utilization end;
the residual load demand determining module is used for determining the residual load demand exceeding the total output power of the renewable energy unit when the load demand is larger than the total output power of the renewable energy unit;
the carbon emission determining module is used for determining carbon emission when the non-renewable energy unit and an external power grid carry out different power output when the load demand of the power utilization end is met in the micro-grid system;
the cost determining module is used for determining the total cost when the output power of the micro-grid system under different carbon emission meets the load demand of the electricity utilization end based on the load demand of the electricity utilization end, the load demand variation of the electricity utilization end and the residual load demand;
and the operation mode determining module is used for determining the operation mode of the micro-grid system meeting the requirements of users according to the carbon emission and the total cost.
9. An electronic device, comprising: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the steps of the method for determining the operational mode of a micro grid system comprising electrochemical energy storage according to any one of claims 1-7.
10. A computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the steps of the method for determining the mode of operation of a microgrid system comprising electrochemical storage according to any one of claims 1-7.
CN202310512759.7A 2023-05-08 2023-05-08 Method and device for determining running mode of micro-grid system containing electrochemical energy storage Pending CN116488243A (en)

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